内蒙古乌拉特后旗查干德尔斯钼矿成矿岩体地球化学特征及成岩作用
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摘要
查干德尔斯钼矿床是近年来在内蒙古西部中蒙边境地区发现的一个具大型规模的隐伏矿床，辉钼矿化呈浸染状、团块状、细脉状分布在中细粒二长花岗岩体中，具斑岩型矿床的特点。矿床成矿期花岗岩为似斑状黑云母二长花岗岩，刘翼飞等（2012）对花岗岩样品进行锆石SHRIMP U-Pb年龄测定结果分别为253.3±2.8Ma和253.8±3.7Ma，显示成矿期花岗岩形成于253-254Ma，为晚二叠世。蔡明海（2011）对矿区辉钼矿Re-Os测年研究（~243Ma）对比显示，矿床的成岩成矿时间差约为10Ma，这与成矿期花岗岩的结构构造特征相符，也可与国内外较多的斑岩型矿床类比，反映出查干德尔斯钼矿床是成矿岩体——黑云母二长花岗岩经历长时间岩浆-热液演化的产物。
元素地球化学研究显示，成矿期花岗岩具有高硅、高碱、过铝质和高钾钙碱性特征。其源岩受到早期陆缘弧俯冲作用改造及地壳物质混染，后来发生部分熔融。花岗岩微量元素也继承了早期陆缘弧成因的一些特征。岩浆形成以后，在深部岩浆房内发生了以斜长石和钾长石为主导的分离结晶作用，并在上侵到地壳浅部区域后受下元古界宝音图群的混染，赋矿花岗岩体形成的构造背景为古生代末期向中生代转换的后碰撞环境。
Chagandeersi molybdenum deposit, located in central-west Inner Mongolia,China, is a newly discovered large scale deposit. It is a porphyry molybdenumdeposit characterized by disseminated, spot and veinlet mineralizations hosted inmedium-fine grained monzonitic granite. Geochronological and elemental data arepresented for the ore-forming granites. The data(by Liu Yifei,2012) show that theore-forming granite was emplaced and crystallized in the Late Permian(253-254Ma).Compared with the molybdenite Re-Os dating(243Ma) form literature(CaiMinghai,2011), it indicate that the Chagandeersi molybdenum deposit was formedabout10Ma after the ore-forming granite.
The major elements data show these granites are high K calc-alkaline series,metaluminous-peraluminous and characteristic of high silicon, high alkali.Combined with the trace elements features, it indicates that the ore-forming magmasis most plausibly originated by partial melting of previous subduction modifiedsource, and has inherited some features of subduction related magma. Theore-forming magma has undergone plagioclase and potash feldspar dominatedcrystal fractionation process before transported to the ore forming structure and werecontaminated by the baoyintu gneiss. The forming of these granites andChagandeersi molybdenum deposit were favored by the post-collision regime as thechemical features show.
元素地球化学研究显示，成矿期花岗岩具有高硅、高碱、过铝质和高钾钙碱性特征。其源岩受到早期陆缘弧俯冲作用改造及地壳物质混染，后来发生部分熔融。花岗岩微量元素也继承了早期陆缘弧成因的一些特征。岩浆形成以后，在深部岩浆房内发生了以斜长石和钾长石为主导的分离结晶作用，并在上侵到地壳浅部区域后受下元古界宝音图群的混染，赋矿花岗岩体形成的构造背景为古生代末期向中生代转换的后碰撞环境。
Chagandeersi molybdenum deposit, located in central-west Inner Mongolia,China, is a newly discovered large scale deposit. It is a porphyry molybdenumdeposit characterized by disseminated, spot and veinlet mineralizations hosted inmedium-fine grained monzonitic granite. Geochronological and elemental data arepresented for the ore-forming granites. The data(by Liu Yifei,2012) show that theore-forming granite was emplaced and crystallized in the Late Permian(253-254Ma).Compared with the molybdenite Re-Os dating(243Ma) form literature(CaiMinghai,2011), it indicate that the Chagandeersi molybdenum deposit was formedabout10Ma after the ore-forming granite.
The major elements data show these granites are high K calc-alkaline series,metaluminous-peraluminous and characteristic of high silicon, high alkali.Combined with the trace elements features, it indicates that the ore-forming magmasis most plausibly originated by partial melting of previous subduction modifiedsource, and has inherited some features of subduction related magma. Theore-forming magma has undergone plagioclase and potash feldspar dominatedcrystal fractionation process before transported to the ore forming structure and werecontaminated by the baoyintu gneiss. The forming of these granites andChagandeersi molybdenum deposit were favored by the post-collision regime as thechemical features show.
引文
蔡明海,彭镇安,屈文俊,等．内蒙古乌拉特后旗查干德尔斯钼矿床地质特征及Re-Os测年[J]．矿床地质,2012,30(3)：377-384
蔡明海,张志刚,屈文俊,等．内蒙古乌拉特后旗查干花钼矿床地质特征及Re-Os测年[J]．地球学报,2010,32(1)：64-68
黎彤,倪守斌．《地球和地壳的化学元素丰度》[M]．北京：地质出版社,1990
李昌年．火成岩微量元素岩石学[M]．武汉：中国地质大学出版社，1992
李锦铁．中国大陆地质历史的旋回与阶段[J]．中国地质,2009,36(3)：524-527
李俊建．内蒙古阿拉善地块区域成矿系统[D]．北京：中国地质大学，2006：23-25
李永峰,王春秋,白凤军,等．东秦岭钼矿Re-Os同位素年龄及其成矿动力学背景[J]．矿产与地质,2004,18(6)：571-578
刘翼飞,聂风军,江思宏,等．内蒙古查干花钼矿床成矿流体特征及矿床成岩[J]．吉林大学学报(地球科学版),2011,41(6)：1794-1805
刘翼飞,聂风军,江思宏,等．内蒙古查干花钼矿区成矿花岗岩地球化学、年代学及成岩作用[J].2012,28(2):409-420
毛景文,谢桂青,李晓峰,等．大陆动力学演化与成矿研究：历史与现状——兼论华南地区在地质历史演化期间大陆增生与成矿作用[J].矿床地质，2005，24(3)：193-205
内蒙古自治区地质矿产局．内蒙古自治区区域地质志[M]．北京：地质出版社，1991
聂凤军，江思宏，张义，等．中蒙边境中东段金属矿床成矿规律和找矿方向[M]．北京：地质出版社，2007
邱家骧，林景仟．岩石化学[M]．北京：地质出版社，1991
孙珍军．小兴安岭石林公园(钨)成矿作用及地球化学特征[D]．吉林：吉林大学，2010
涂光炽．矿床地球化学[M]．北京：地质出版社．1997：1-112
王中刚，于学元，赵振华，等．稀土元素地球化学[M]．北京：科学出版社，1989
魏庆国,高昕宇,赵太平,等．大别北麓汤家坪花岗斑岩锆石LA-ICPMS U-Pb定年和岩石地球化学特征及其对岩石成因的制约[J]．岩石学报,2010,26(5)：1550-1562
吴泰然，何国琦．内蒙古阿拉善地块北缘的构造单元划分及各单元的基本特征[J]．地质学报，1993,67(2)：97-108
席忠,张志刚,贾立炯,等．内蒙古尼玛图－查干花大型钼－铋－钨矿化区的发现及地质意义[J].地球学报,2010,31(3)：466-468
肖荣阁,刘敬党,费红彩,等.岩石矿床地球化学[M]．北京：地震出版社，2007
杨学明，杨晓勇，等译．岩石地球化学．[英]Hugh R.Rollison著．合肥：中国科学技术大学出版社，2000
杨泽强．河南商城县汤家坪钼矿铼－锇同位素年龄及地质意义[J]．矿床地质,2007,26(3)：289-295
姚凤良，孙风月．矿床学教程[M]．北京：地质出版社，2006
赵振华．微量元素地球化学原理[M]．北京：科学出版社，1997
Aldanmaz E, Pearce JA, Thirlwall MF and Mitchell JG．Petrogenetic evolution of Late Cenozoic,post-collision volcanism in western Anatolia, Turkey[J]．Journal of Volcanology andGeothermal Research,2000,102：67-95
Condie KC．Geochemical changes in basalts and andesites across the Archean-Proterozoicboundary：Identification and significance[J]．Lithos,1989,23：1-18
Davidson JP, Dungan MA, Ferguson KM and Colucci MT．Crust-magma interactions and theevolution of arc magmas：The San Pedro-Pellado Volcanic complex, southern ChileanAndes[J]．Geology,1988,15：443-446
DePaolo DJ．Trace element and isotopic effects of combined wall-rock assimilation and fractionalcrystallization[J]．Earth and Planetary Science Letters,1981,53：189-202
Kuscu GG and Geneli F． Review of post-collisional volcanism in the Central Anatolian VolcanicProvince(Turkey), with special reference to the Tepekoy Volcanic Complex．Int.J. Earth Sci,2010,99：593-621
Meng QR．What drove late Mesozoic extension of northern China-Mongolia tract[J]．Tectonophysics,2003,369：155-174
Pearce JA, Harris NB and Tindle AG．Trace element discrimination diagrams for the tectonicinterpretation of granitic rocks[J]．Journal of Petrology,1984,25(4)：956-983
Pearce JA．Sources and settings of granitic rick[J]．Episodes,1996,19(4)：120-125
Roberts MP and Clemens JD．rigin of high-postassium, talcalkaline, I-type granitoids[J]．Geology,1993,21(9)：825-828
Selby D and Creaser RA．Re-Os geochronology and systematics in molybdenite from the Endakoporphyry molybdenum deposit, British Columbia, Canada[J]．Economic Geology,2001,96：197-204
Xiao WJ, Windley BF, Hao J and Zhai MG．Accretion leading to collision and the PermianSolonker suture, Inner Mongolia, China：Termination of the central Asian orogenicbelt[J]．Tectonic,2003,22：1484-1505
Zeng QD, Liu JM, Qin F and Zhang ZL．Geochronology of the Xiaodonggou porphyry Modeposit in northern margin of North China Craton[J]．Resource Geology,2010,60：192-201
蔡明海,张志刚,屈文俊,等．内蒙古乌拉特后旗查干花钼矿床地质特征及Re-Os测年[J]．地球学报,2010,32(1)：64-68
黎彤,倪守斌．《地球和地壳的化学元素丰度》[M]．北京：地质出版社,1990
李昌年．火成岩微量元素岩石学[M]．武汉：中国地质大学出版社，1992
李锦铁．中国大陆地质历史的旋回与阶段[J]．中国地质,2009,36(3)：524-527
李俊建．内蒙古阿拉善地块区域成矿系统[D]．北京：中国地质大学，2006：23-25
李永峰,王春秋,白凤军,等．东秦岭钼矿Re-Os同位素年龄及其成矿动力学背景[J]．矿产与地质,2004,18(6)：571-578
刘翼飞,聂风军,江思宏,等．内蒙古查干花钼矿床成矿流体特征及矿床成岩[J]．吉林大学学报(地球科学版),2011,41(6)：1794-1805
刘翼飞,聂风军,江思宏,等．内蒙古查干花钼矿区成矿花岗岩地球化学、年代学及成岩作用[J].2012,28(2):409-420
毛景文,谢桂青,李晓峰,等．大陆动力学演化与成矿研究：历史与现状——兼论华南地区在地质历史演化期间大陆增生与成矿作用[J].矿床地质，2005，24(3)：193-205
内蒙古自治区地质矿产局．内蒙古自治区区域地质志[M]．北京：地质出版社，1991
聂凤军，江思宏，张义，等．中蒙边境中东段金属矿床成矿规律和找矿方向[M]．北京：地质出版社，2007
邱家骧，林景仟．岩石化学[M]．北京：地质出版社，1991
孙珍军．小兴安岭石林公园(钨)成矿作用及地球化学特征[D]．吉林：吉林大学，2010
涂光炽．矿床地球化学[M]．北京：地质出版社．1997：1-112
王中刚，于学元，赵振华，等．稀土元素地球化学[M]．北京：科学出版社，1989
魏庆国,高昕宇,赵太平,等．大别北麓汤家坪花岗斑岩锆石LA-ICPMS U-Pb定年和岩石地球化学特征及其对岩石成因的制约[J]．岩石学报,2010,26(5)：1550-1562
吴泰然，何国琦．内蒙古阿拉善地块北缘的构造单元划分及各单元的基本特征[J]．地质学报，1993,67(2)：97-108
席忠,张志刚,贾立炯,等．内蒙古尼玛图－查干花大型钼－铋－钨矿化区的发现及地质意义[J].地球学报,2010,31(3)：466-468
肖荣阁,刘敬党,费红彩,等.岩石矿床地球化学[M]．北京：地震出版社，2007
杨学明，杨晓勇，等译．岩石地球化学．[英]Hugh R.Rollison著．合肥：中国科学技术大学出版社，2000
杨泽强．河南商城县汤家坪钼矿铼－锇同位素年龄及地质意义[J]．矿床地质,2007,26(3)：289-295
姚凤良，孙风月．矿床学教程[M]．北京：地质出版社，2006
赵振华．微量元素地球化学原理[M]．北京：科学出版社，1997
Aldanmaz E, Pearce JA, Thirlwall MF and Mitchell JG．Petrogenetic evolution of Late Cenozoic,post-collision volcanism in western Anatolia, Turkey[J]．Journal of Volcanology andGeothermal Research,2000,102：67-95
Condie KC．Geochemical changes in basalts and andesites across the Archean-Proterozoicboundary：Identification and significance[J]．Lithos,1989,23：1-18
Davidson JP, Dungan MA, Ferguson KM and Colucci MT．Crust-magma interactions and theevolution of arc magmas：The San Pedro-Pellado Volcanic complex, southern ChileanAndes[J]．Geology,1988,15：443-446
DePaolo DJ．Trace element and isotopic effects of combined wall-rock assimilation and fractionalcrystallization[J]．Earth and Planetary Science Letters,1981,53：189-202
Kuscu GG and Geneli F． Review of post-collisional volcanism in the Central Anatolian VolcanicProvince(Turkey), with special reference to the Tepekoy Volcanic Complex．Int.J. Earth Sci,2010,99：593-621
Meng QR．What drove late Mesozoic extension of northern China-Mongolia tract[J]．Tectonophysics,2003,369：155-174
Pearce JA, Harris NB and Tindle AG．Trace element discrimination diagrams for the tectonicinterpretation of granitic rocks[J]．Journal of Petrology,1984,25(4)：956-983
Pearce JA．Sources and settings of granitic rick[J]．Episodes,1996,19(4)：120-125
Roberts MP and Clemens JD．rigin of high-postassium, talcalkaline, I-type granitoids[J]．Geology,1993,21(9)：825-828
Selby D and Creaser RA．Re-Os geochronology and systematics in molybdenite from the Endakoporphyry molybdenum deposit, British Columbia, Canada[J]．Economic Geology,2001,96：197-204
Xiao WJ, Windley BF, Hao J and Zhai MG．Accretion leading to collision and the PermianSolonker suture, Inner Mongolia, China：Termination of the central Asian orogenicbelt[J]．Tectonic,2003,22：1484-1505
Zeng QD, Liu JM, Qin F and Zhang ZL．Geochronology of the Xiaodonggou porphyry Modeposit in northern margin of North China Craton[J]．Resource Geology,2010,60：192-201